Measuring and mixing device



Dec. 31, 1929. R. G. MCDONALD 1,741,325

MEASURING AND MIXING DEVICE Filed Jan. 4, 1929 5 Sheets-Sheet l l VN'LOR @mmmam 3.. Sheets-S1 2 R. G. MCDONALD Filed Jan. 1929 Dec. 3],19294.

I MEASURING AND MIXING DEVICE W 55 ATTORNEY-5 Dec. 3l, 1929.

R. G M DONAL LD MEASURING AND MIXING DEVICE Filed Jan. 4, 19

3 Sheets-Sheet 3 %zLsATToRNEYs Patented Dec. 31, 1929 UNHTED STATESROLAND G. MCDONALD, OF EAST ROCHESTER, NEW YORK MEASURING AND MIXINGDEVICE Application filed January 4, 1929. Serial a... 330,320.

This invention relates to the measurement and mixing of liquids, andalso and more particularly to the mixing of a core .sand binder and itsapplication to the core sand. Heretofore in the preparation of coresand, the preparation of the binder and its addition to the sand hasbeen uncertain and unsatisfactory, and required considerable manuallabor. The mixtures of the binder, and the binder and sand wereuncertain, variable, and far. from uniform, being dependent largely uponestimates of the workmen.

An object of this invention is to provide improvedmeans for measuringliquids accurately, and for mixing liquids in accurate proportions, withwhich the measuring and mixing operations may be rapidly performed witha minimum of apparatus and a mini mum of supervision and labor; andwhich will be relatively simple, practical, convenient, occupy a minimumof space, and be relatively inexpensive.

, A further and more specific object is to provide an improved methodand apparatus for measuring accurately and mixing the in gredients of acore .sand binder, and uniformly applying the same to the core sand.

Various other objects and advantages will be apparent from the followingdescription of an embodiment of the invention, and the novel featureswill be particularly pointed out in the appended claims.

In the accompanying drawings:

Fig. 1 is a side elevation of a core sand mixing. device havingassociated therewith a binder measuring and mixing device, constructedin'accordance with this invention;

Fig. 2isa plan of the same;

Fig. 3' is a sectional elevation through a portion of the mixingreceptacle and sprayer, the section being taken approximately along theline 3 '8 -of Fig. 2; and fFig. 4 is an elevation of supply andmeasuring tanks and other relatedpartsfor measuring and mixing thebinder liquids.

In the illustrated embodiment of the in vention, the core sand to beused is measured and deposited in a loading device 10, which is thenelevated todeposit its contents into a mixing" casing or receptacle 11.This re 'may also be connected to the operating the loadmg device 10.sand mixing operation is complete, the con-.

ceptacle may have paddles or stirring devices 12 carried by a head 13that is provided upon the receptacle 11 and is connected by gears 16 tothe shaft 1 for rotating the paddles or stirring devices 12. A suitablesource of power, such as a motor 17 is connected by,

a belt or chain 18 and a pulley 19 to the shaft 15 to drive the same. A.driving device 20 shaft 15'for After the tents of the receptacle may bedischarged by operation of a suitable device controlled by a lever 21.The mechanism just described is old in the art, and therefore a morespecific description of the details of the same is omit-; ted in theinterest of clarity.

The ingredients of the binder are stored in suitable supply tanks 22 and28, and the ingredients from these tanks are measured separately inspecial measuring tanks 24 and which are preferably disposed below thesupply tanks in order that the liquid ingredients from the supply tanksmay flow into the measuring tanks to fill the same entirely by gravity.measuring tank 25 by a suitable pipe 26. This pipe may be provided witha manually controlled valve 27 and also With a one-way or check valve27, which latter prevents return flow of the liquid from the tank 25but.

permits of the passage of the liquid from the supply tank into thatmeasuring tank. The supply tank 23 is also connected by a pipe 28 withthe measuring tank 24:, and may be similarly provided with a manuallyoperated valve 29 and a one-way or check valve 85, the latter of whichprevents passage of the liquid out of this measuring-tank, into thesupply tank. V

The bottom portion of one of themeasuring tanks, such as 25, isconnected by a pipe 31-to a suitable part of the other measuring to alevel above the supply tanks 22 and 23, so that the liquids in themeasuring tanks will never pass from one measuring tank to The tank 22is connected to its.

'tank 24-, and this pipe preferably extends another during the fillingoperation. Thus the pipe 31 should extend to a level above the highestlevel to which the liquid from' either measuring tank will be forceddurlng a filling operation by the pressure exerted upon said liquidsduring filling and while in the measuring tanks. This connecting pipe 31also serves to trap some air or gas between the measuring tanks for afunction which will be explained hereinafter. Air vent pipes 32 and 33extend upwardly re spectively from the measuring tanks 24 and 25, andare connected to air'vent valves anc 33 respectively and also to apressure control valve 34 through a cross connection extending betweenthe pipes 32 and 33 and comprising short pipes 35 and 35. The controlvalve is also connected to a pipe 36 which supplies compressed fluid,such as air, to the pipes 32 and 33 when permitted by suitable operationof the valve 34. The valve 34, in one position, is adapted to connectpipe 36 with both pipes 32 and 33 and is also adapted to alternatelyopen and close the short pipe sections 35 and 35 Valve 34 is arranged tobe operated by a hand wheel 37 on a suitable stem which carries a gear37 meshing with smaller gears 32 and 33 which are rigid onthe stems ofvalves 32 and 33 respectively, from which extend short vent pipes 38 and38 as shown in 4. When the valve34 is in position to open either ofpipes 32 or 33 for communication with pipe 36 both vent valves will beclosed. Upon turning the hand wheel 37 in one direction from the normalposition shown in 4, pipe 32 will be closed and pipe 33 opened, at whichtime vent valves 33 and 32 will be closed. By reversing the movement ofthe hand wheel, pipe 33 will be closed and pipe 32 will be opener Thehandle 37 can also be moved to a position at which the supply pipe 36will be closed and th vent valves opened at the same time.

Thebottom ot' the tank 24 is connected by a delivery pipe 39 to theinterior of the mixing receptacle 11. The delivery pipe terminateswithin the receptacle 11 in arcuate branches 40 extending along the sidewall of the receptacle and adjacent its top. The pipe branches 40 areprovided with jet apertures 41 through whicn the liquid mixture from themeasuring tanks will be sprayed obliquely into the interior of thereceptacle.

If any of the ingredients in the supply tank are of a charactertendingto settle into component parts, or require agitation to keepthemiuniform, any supply tank may be provided with a battle wall 42disposed in spaced relation to the bottom and sidewalls of the tank.Such battle walls are preferably conical and upright, and imperforate intheir interiorportion. A pipe 43 depending into the tank extends belowthe batlie wall 42 and terminates in arcuate branches 44 havingapertures; The pipe 43 may have a control- 22 and 23 ling valve 45, andis connected to a source of a suitable gas, such as air under pressure.Thus the admission of air or gas beneath the battle wall 42 will tend tokeep the contents of the supply tank 23 agitated, and prevent thesettling out of any of the denser portions.

Ingredients commonly employed for a binder of core sand are a suitableoil and a resinous product known in thetrade as gu-' lack. This gulackis a liquid from the pulp digester tanks employed in the paper pulpindustry, and carries the resins which were contained in the wood andliberated when the fibers were disintegrated by the action of thedigester liquid. The oil and gulack are mixed in suitable desiredproportions and sprayed into the core sand as the latter is being mixed.The gulack has a tendency to settle into portions of different densityand, therefore will be stored in the supply tank 23 having the agitatingmeans.

Theoperation is as follows: A charge of the sand mixture is deposited inthe mixing casing or receptacle 11 and the stirring paddies 12 startedin operation. An attendant" operates the valves in a manner to vent thepipes 32 and 33 and to keep the compressed gas in the pipe 36 shut offfrom the pipes 32 and 33. The oil and will flow by gravity into themeasuring tanks 24 and 25. The filling will stop automatically when thelevel in the pipes 32 and 33 reaches the level of the liquids in thesupply tanks. More or less air or gas will be trapped in the pipe 31,which prevents the level of the liquids rising to any great extent inthis pipe.

The attendant then further operates the valves to close the vents to thepipes 32 and 33, and to connect the compressed air pipe 36 selectivelywith one or the other of the pipes 32 and Assuming that the oil andgulack are to be mixed and both added to the core sand, the connectionwill be made to the pipe The compressed air or gas from the pipe 36 willthen pass through the pipe 33 into the oil measuring tank 25, and forceits contents through the pipe 31 into the gulack measuring tank 24,carrying with it the air or which was trapped in the pipe 31. Thegulack, air and oil from the tank 24 will be forced through the deliverypipe .39 into the arcuate sprayer sections 40, and thence sprayed uponthe sand in the mixing receptacle while the sand is being agitated orstirred by the paddles 12. During this operation, the one-way orcheckvalves 27 and 30 will prevent passage of the oil and gulack back intothe supply tanks.

The air or gas trapped in the pipe 31 and which was carried into thegulack tank 24 under pressure serves to churn up or agitate the gulackandcauseit to team, thereby obp n m r thorou an int mate r s gulack fromthe tanksv ture with the oil. This foaming *mixture'is filling of themeasuring tanks in the manner above explained. 7

If one desires-to discharge onlythe gulack from the tank 24, the valve34 Will'b'e so operated as to connect the. pipe 36 only with the pipe32,'and the compressed gas Will therefore pass directly into the tank 24and force its contents through the delivery pipe 39 and into the mixingreceptacle 11. There being no open outlet for the tank 25, no move mentof the oil therein Will occur.

lVith such a device it will be observed that the liquid ingredients ofthe binder may be measured accurately in a simple and rapid manner, andall of the operations may be performed under the control of a singlevalve operating Wheel 37. The labor required for this purpose is reducedto a minimum, and a minimum of oil and gulack are required for thereason that more uniform and dependable mixtures are obtained, and theingredients more accurately measured.

While the invention has been described in connection With the measuringand mixing of the liquid ingredients of a core sand binder, as well asthe application of such a binder to the core sand, it will be understoodthat the measuring and mixing features are of course, useful for otherpurposes Where similar problems exist, and may be so employed Within.the principle of the invention. It Will also be obvious that changes inthe various details which have been herein described and illustrated inorder to explain the nature of the invention, may be made by thoseskilled in the art Within the principle and scope of the invention asexpressed in the appended claims.

I claim as my invention:

1. In measuring and mixing devices, a plurality of measuring tanks,means including individual connections to said tanks for supplying toeach tank a liquid under pressure, means for preventing return flow ofsaid liquids from said tanks When the tanks contents are subjected topressures greater than those from said supply means, a pipe connectingthe lower part of one tank With the other tank to form an air trapbetween said tanks,

said air trap p1pe extending above the upper ends of said tanks and alsoserving as a transfor connection between them, a delivery pipe connectedto said other tank, a source of fluid under a pressure greater than thepressure of said liquids in said tanks from said supply means, and meansfor relieving the pressure in said'tanksto permit them 'tolil'l\vith'liquid from said supply means and then admitting compressed fluidto said one tank for forcing the contents of that tank into the othertank through saidair trap pipe, and for forcing Hall of the contents ofall itanks through said delivery pipe.

2. Inmeasuring and mixing devices, a plurality of measuring tanks, valvecontrolled means for admitting liquids to said tanks, a

pipe connecting the bottom portion of one tank to the other tank, theconnection with the last mentioned tank being above the point at whichthe pipe is connected with the other tank, said pipe extending above oneof the tanks to form an air trap for checking the passage of liquid fromone tank to another When the tanks are being filled, a delivery pipeleading from the other of said tanks, means for venting both of saidtanks to permit them to be filled, and means for supplying acompresse-d'fluid to said one of the tanks to force its contentsinto-the other tank'and the contents of both tanks through said deliverypipe.

3. In measuring and mixing devioes,-a pluralityof measuring tanks, valvecontrolled means for admitting liquids to said tanks, a pipe connectingthe bottom portion of one tank to the other tank, a delivery pipeleading from theother of said tanks, means for venting both of saidtanksto permit them to be filled, and means for supplying acompressed fluidto said one of the tanks to force its contents into "the other tankandthe contents of both tanks'through'said'delivery pipe,

said pipe connecting-the tanks toone another extending materially abovethe upper endsof thetanks so as to form an air trap preventing passageof the liquid from one tank to the other durlng filling operation.

4:. In a'mixing and measuring device, aplurality of measuring-tanks, aplurality of supply tanks disposed at-a level above the measuring tanksand. connected individually to said measuring tanks for filling thesame, check valves provided in the connections between the supply tanksand the measuring tanks for preventing return fiow of the liquids in themeasuring tanks to the supply tanks, a pipe connecting the bottomportion of one measuring tank to another measuring tank, a delivery pipeconnected to the bottom. portion of said another measuring tank,

means for venting said measuring tanks to permit them to fillautomatically from said supply tanks, and means forsupplying com pressedfluid to said one 'of the measuring tanks 'Which is connected to theother for forcing its contents from tank to tank and through saiddelivery pipe,thepipe connecting said measuring tanks extending abovethe level of thesupply tanks to prevent passage of liquid from one'tanktoanot-her during the filling operation.

5. In measuring and mixing devices, a pair of measuring tanks, meansincluding supply pipes connected individually to said tanks forsupplying liquids thereto, check valves in said pipes for preventingreturn flow of the liquids, a pipe connecting the bottom portion of onetank to the other tank and rising to a height greater than the liquidwould rise therein from either tank under the pressure to Which it issubjected during the filling operation, a delivery pipe connected tosaid other tank, and means for venting said tanks to permit them to filland for admitting compressed fluid to said one of the tanks to force itscontents into said other tank and the contents of both tanks to saiddelivery pipe.

6. In mixing and measuring devices, a pair of measuring tanks, liquidsupply pipes connected to said measuring tanks and including checkvalves to prevent return flow of liquid from said measuring tanks, meansfor supplying liquids under pressure to said supply pipes, a pipeconnecting the bottom p0rtion of one tank to the other tank and risingto a height greater than the liquid would he forced therein from eitherof said tanks under the pressure of the liquids which are admittedthereto, said other tank havin a delivery orifice, and means for ventingsaid tanks to permit them to fill and for admitting a com pressed fluidto said one of the tanks to force its contents through the connectingpipe into the other tank and the contents of both tanks through saiddelivery orifice.

7. In mixing and measuring devices, a pair of measuring tanks, liquidsupply pipes connected to said measuring tanks and including checkvalves to prevent return flow of liquid from said measuring tanks, meansfor supplying liquids under pressure to said supply pipes, a pipeconnecting the bottom portion of'one tank to the other tank and risingto a height greater than the liquid would he forced therein from eitherof said tanks under the pressure of the liquids Which are ad mittedthereto, said other tank having a delivery orifice, vent pipes leadingfrom the upper portions of said tanks, a pipe for supplying a source ofcompressed fluid connected to said vent pipes, valve means controllingthe admission of compressed fluid to either of said vent pipesselectively, and valve means for venting said vent pipes to permit thetanks to fill automatically.

8. In mixing and measuring devices, a pair of measuring tanks, liquidsupply pipes con- 'nected to said measuring tanks and including checkvalves to preventreturn low of liquid from said measuring tanks, meansfor supply ng liquids under pressure to said supply pipes, a pipeconnecting the bottom portion of one tank to the other tank and risingto a hei ht greater than the liquid Would be forced therein from eitherof said tanks under the pressure of the liquids Which are admittedthereto, said other tank having a delivery orifice, vent plpes leadingfrom the upper portions of said tanks, a pipe for supplying a source ofcompressed fluid connected to said vent pipes, valve means controllingthe admission of compressed fluid to either of said vent pipesselectively, and valve means for venting said vent pipes to permit thetanks to fill automatically, said valve means being connected togetherfor common operation and so related as to cause a closing of the ventswhen the compressed fluid is admitted to either vent pipe. v

ROLAND G. MODONALD.

